RE: Histograms - SIZE clause & num_buckets anomaly

From: Wolfgang Breitling <breitliw_at_centrexcc.com>
Date: Mon, 02 Aug 2004 08:42:54 -0600
Message-Id: <6.1.0.6.2.20040802084114.02fe3bb8@pop.centrexcc.com>

At 07:41 AM 8/2/2004, you wrote:

>Thanks Wolfgang,
>
>Yes, doubling the size parameter created frequency based histograms. Seems
>very weird though. BTW, I am seeing exactly the same behaviour in 8.1.7.4
>environment.

I have never seen that in Oracle 8i.

>And unless one is aware of this quirk, this creation of height-based
>histograms instead of f.b. histograms will affect the query execution plans
>adversely, isn't it?

Very possibly.

Regards

Wolfgang Breitling
Centrex Consulting Corporation
www.centrexcc.com

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Received on Mon Aug 02 2004 - 09:39:02 CDT